The battle is split into two phases; the first phase requires Sonic to get behind the Death Egg Robot to hit its unarmored posterior as they ride up an elevator, while the second phase has Sonic trick the Death Egg Robot into punching a platform as a Dimensional Bomb explodes, temporarily immobilizing the arm long enough for Sonic to run up the arm and attack the robot's head. It takes a total of four hits to defeat the Death Egg Robot.
On Hard mode, the Death Egg Robot is much faster at shooting his arms at Sonic and must be hit four times whilst on the elevator as opposed to two. In the second phase, there are fewer bombs and all the switches are placed on platforms above the bombs, making it harder to get close to them without setting them off. This time, it takes a total of six hits to defeat the Death Egg Robot.
|Sunny Side Up||Defeat Death Egg Robot. (20G, Secret)|
- This is the first boss fight for Sonic Generations to appear in any trailer, but not the first to be announced officially. This honor goes to Big Arm, a boss in the Nintendo 3DS version of the game.
- This is the only boss in the game that was originally fought by Sonic in his normal form, as Perfect Chaos was fought by Super Sonic and Egg Dragoon was fought by the Werehog.
- In the original battle in Sonic the Hedgehog 2 and redone in Sonic the Hedgehog 4: Episode I, after Sonic destroyed the Death Egg Robot the space station started to explode. However, the Death Egg does not begin to explode after Classic Sonic defeated the mech in Sonic Generations.
- In a pre-release video, it is also called the "Death Egg Walker." It is unknown if this was considered as an official term, or if the person doing the overview came up with the name on the spot.
- This suit is notably larger than either of its two predecessors. Also, rather than firing its arms, it extends them.